with an appropriate receptacle. An adapter may be used
to connect this plug to a standard two contact system. When
the adapter is used, the ground connection is brought out on
a short wire. This ground lead should then be connected to
a suitable ground for the protection of operating personnel.
INPUT AND OUTPUT
The input and output jacks on the control panel, require special
200-ohm connectors and cables. (See paragraph 1-2).
2 -4 OPERATION
Connect the Model 460B to the power line, turn on the power
switch and the instrument is in operation.
To use as a linear amplifier to amplify sine waves, etc. , or
pulses of either polarity, set the LINEAR-PULSE switch to the
LINEAR position. When the LINEAR-PULSE switch is in this
position the output is limited to 16 volts peak into an open circuit
or 8 volts peak into a 200-ohm load. It must be remembered that
a phase reversal between input and output is present and that a
positive input pulse appears in the output as a negative pulse.
To realize the full output capabilities of the Model 46OB, the
LINEAR-PULSE switch must be in the PULSE position and a posi-
tive pulse of about 8 volts peak be supplied to the input.
In the PULSE position of the LINEAR-PULSE switch the amplifier
tubes are operated at higher than normal supply voltages. The
grid bias is increased to keep tube dissipation within ratings.
Under these conditions (1-8 volt input) the rated tube dissipation is
reached with a duty cycle of 10%. Lower driving voltages will
allow proportionally higher duty cycles, but the output voltage
will be lower. See Figure 3.
In order to supply this 8-volt positive pulse to a Model 460B, the
units may be cascaded or used with one or more Model 46OA
Wide Band Amplifiers, see Figure 4. In general, when cascading
460 amplifiers, consideration must be given to the polarity as
well as the amplitude of the pulse to be amplified. For maximum
deflection, the set-up must be arranged so that the input to the
last 460BR amplifier is positive and of approximately 8 volts peak
amplitude. This is easily done because the 460BR inverts the in-
put pulse. Hence, an additional 460B can be used when necessary
to invert pulse polarity. In most applications an input of about 4
volts is sufficient to give satisfactory deflection of a cathode-ray
tube. Certain precautions must be taken when cascading several
460 Amplifiers, see Paragraph 2-2, INSTALLATION.
-5- |
ACEC
HEWLETT-PACKARD
